DPR [1]} adopts the retriever–reader design proposed by [2]} for the open-domain QA task.
Both the task formulation and the pipeline architecture for tackling the task date from the late 1990s [3]}, so this general approach has a long history that predates neural networks.
The open-source code associated with the paper is available on GitHub (which we refer to as “the DPR repo”),https://github.com/facebookresearch/DPR but it does not appear to contain code and models necessary to reproduce all results reported in the paper (more detailed discussions below).
